diff --git a/reactos/include/reactos/mingw-w64/reactos.diff b/reactos/include/reactos/mingw-w64/reactos.diff
deleted file mode 100644
index 905f7ba3377..00000000000
--- a/reactos/include/reactos/mingw-w64/reactos.diff
+++ /dev/null
@@ -1,83 +0,0 @@
-Index: internal.h
-===================================================================
---- internal.h	(Revision 46537)
-+++ internal.h	(Arbeitskopie)
-@@ -35,6 +35,12 @@
- #define __IOINFO_TM_UTF8 1
- #define __IOINFO_TM_UTF16LE 2
- 
-+#ifdef _MSC_VER
-+#pragma warning(push)
-+#pragma warning(disable:4214)
-+#pragma warning(disable:4820)
-+#endif
-+
-   typedef struct {
-     intptr_t osfhnd;
-     char osfile;
-@@ -46,6 +52,10 @@
-     char pipech2[2];
-   } ioinfo;
- 
-+#ifdef _MSC_VER
-+#pragma warning(pop)
-+#endif
-+
- #define IOINFO_ARRAY_ELTS (1 << 5)
- 
- #define _pioinfo(i) (__pioinfo[(i) >> 5] + ((i) & (IOINFO_ARRAY_ELTS - 1)))
-Index: oscalls.h
-===================================================================
---- oscalls.h	(Revision 46537)
-+++ oscalls.h	(Arbeitskopie)
-@@ -30,6 +30,11 @@
- #endif
- #endif
- 
-+#ifdef _MSC_VER
-+#pragma warning(push)
-+#pragma warning(disable:4214)
-+#endif
-+
- typedef struct _FTIME
- {
-   unsigned short twosecs : 5;
-@@ -46,6 +51,10 @@
-   unsigned short year : 7;
- } FDATE;
- 
-+#ifdef _MSC_VER
-+#pragma warning(pop)
-+#endif
-+
- typedef FDATE *PFDATE;
- 
- #endif
-Index: sect_attribs.h
-===================================================================
---- sect_attribs.h	(Revision 46537)
-+++ sect_attribs.h	(Arbeitskopie)
-@@ -10,7 +10,7 @@
- #define _ATTRIBUTES shared
- #endif
- 
--#if 0
-+#if defined(_MSC_VER)
- /* Reference list of existing section for msvcrt.  */
- #pragma section(".CRTMP$XCA",long,_ATTRIBUTES)
- #pragma section(".CRTMP$XCZ",long,_ATTRIBUTES)
-@@ -55,6 +55,14 @@
- #pragma section(".rtc$IZZ",long,read)
- #pragma section(".rtc$TAA",long,read)
- #pragma section(".rtc$TZZ",long,read)
-+#pragma section(".tls",long,read,write)
-+#pragma section(".tls$ZZZ",long,read,write)
- #endif
- 
-+#if defined(_MSC_VER)
-+#define _CRTALLOC(x) __declspec(allocate(x))
-+#elif defined(__GNUC__)
- #define _CRTALLOC(x) __attribute__ ((section (x) ))
-+#else
-+#error
-+#endif
diff --git a/reactos/include/reactos/mingw-w64/sect_attribs.h b/reactos/include/reactos/mingw-w64/sect_attribs.h
index 8dde10a6552..ff58c0664f3 100644
--- a/reactos/include/reactos/mingw-w64/sect_attribs.h
+++ b/reactos/include/reactos/mingw-w64/sect_attribs.h
@@ -55,7 +55,9 @@
 #pragma section(".rtc$IZZ",long,read)
 #pragma section(".rtc$TAA",long,read)
 #pragma section(".rtc$TZZ",long,read)
+/* for tlssup.c: */
 #pragma section(".tls",long,read,write)
+#pragma section(".tls$AAA",long,read,write)
 #pragma section(".tls$ZZZ",long,read,write)
 #endif
 
@@ -64,5 +66,5 @@
 #elif defined(__GNUC__)
 #define _CRTALLOC(x) __attribute__ ((section (x) ))
 #else
-#error
+#error Your compiler is not supported.
 #endif
diff --git a/reactos/lib/3rdparty/mingw/tlssup.c b/reactos/lib/3rdparty/mingw/tlssup.c
index aec217dba5e..8153fb6f2bf 100644
--- a/reactos/lib/3rdparty/mingw/tlssup.c
+++ b/reactos/lib/3rdparty/mingw/tlssup.c
@@ -10,15 +10,14 @@
 #undef CRTDLL
 #endif
 
+#include <sect_attribs.h>
+
 #include <windows.h>
+
 #include <stdio.h>
 #include <memory.h>
 #include <malloc.h>
 
-#ifndef _CRTALLOC
-#define _CRTALLOC(x) __attribute__ ((section (x) ))
-#endif
-
 #ifndef __INTERNAL_FUNC_DEFINED
 #define __INTERNAL_FUNC_DEFINED
   typedef void (__cdecl *_PVFV)(void);